Use 0xcf9 write for system reset

It's probably the most bulletproof way on modern systems. Old 0x64 writes does nothing on some systems
2025-02-25 11:22:54 +03:00 · 2025-02-25 11:22:54 +03:00 · caf377abcf
parent 0a70170952
commit caf377abcf
2 changed files with 8 additions and 0 deletions
--- a/arch/x86_32/kernel.s
+++ b/arch/x86_32/kernel.s
@ -470,6 +470,10 @@ ProcessorIn32:
 	ret

 ProcessorReset:
+	mov 	al, 0xe
+	mov	dx, 0xcf9
+	out	dx, al
+
 	in	al,0x64
 	test	al,2
 	jne	ProcessorReset
--- a/arch/x86_64/kernel.s
+++ b/arch/x86_64/kernel.s
@ -780,6 +780,10 @@ MMArchSafeCopy:
 	ret

 ProcessorReset:
+	mov 	al, 0xe
+	mov	dx, 0xcf9
+	out	dx, al
+
 	in	al,0x64
 	test	al,2
 	jne	ProcessorReset